Natural experiments are a powerful tool for understanding causal relationships in the real world.
科学最令人兴奋的方面是发现一些新的东西,一些以前没有人见过的东西。
The best players have the shortest memories.
Be kind,for everyone is fighting a hard battle.And if you really wanna see what people are,all you have to do...is look.
"The only thing that is truly universal is the human experience."